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Civil Engineering Terms

Easy and Understandable Terms Related to Civil Engineering

You are here: Home / Surveying and Levelling / Terms related to Contouring | Objects of Contouring | Uses of Contour maps | Characteristics of Contours | Methods of Contouring

Terms related to Contouring | Objects of Contouring | Uses of Contour maps | Characteristics of Contours | Methods of Contouring

August 29, 2011 by admin Leave a Comment

Contouring:

1.     Contour line

The intersection of ground surface and level surface is called contour line.

2.     Contour interval

The perpendicular distance between two successive contours is known as contour interval.

3.     Horizontal equivalent

The horizontal distance between two successive contours is known as horizontal equivalent

Objects of contouring:

In engineering projects knowledge of contouring is important for determining nature of ground surface.

Uses of contour maps

  1. Ground surface is examined by it.
  2. Its widely used in site  selection.
  3. Storage power of reservoir is calculated.
  4. Two distinct stations are  visible or not is determined.
  5. Catchment can be determined by drawing in any direction.

Characteristics of contours

  1. At top of hills contour lines are near to each other.
  2. If contour lines are equally spaced it represents a uniform slope.
  3. Contour lines never meet each one another.
  4. Contours that are close to each other represents depressions.
  5. Depression between summits is called saddles.

Methods of contouring

There are two methods of contouring

1.        Direct method.

2.        Method of interpolation.

3.        Indirect method.

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